Inside Opus

Beyond the RFC itself, there are a several documents out there that describe Opus or parts of Opus. Not everything
in them applies to the final version of Opus, but they should still be useful to those who want to understand how
Opus works. For an overview of the codec, see the linux.conf.au 2012 Opus presentation.

The most accessible descriptions of Opus are probaly Monty’s demos. We have also written some papers describing the
algorithm in details:

The .opus test set is an in-development larger test suite for .opus files. These are
suitable for testing opusdec and other media-player software. Files prefixed with ‘broken’ and ‘failure’ are
intentionally malformed and at least the latter should be rejected.

Note that these files are designed to exercise all aspects of an implementation, the fact that they sound terrible
is an intended consequence.